Dual-Microstructure Heat Treatment Process for Novel Nickel-Based Powder Metallurgy Superalloy Turbine Disk
A turbine for experiment was produced by vacuum induction melting+powder preparation+hot isostatic pressing+hot extrusion+isothermal forging processes.Samples were taken from the experimental disk for heat treatment tests and mechanical properties tests to determine sub-solvus and super-solvus heat treatment temperature ranges and mechanical property evolution rules of the FGH4113A alloy.In addition,thermal boundary conditions for simulation calculations were obtained through experiments.A method for designing heat treatment processes for full-size turbine disk components based on experiment and finite element analysis was proposed.Using this method,a full-size dual-microstructure turbine disk was successfully fabricated,and the microstructure and mechanical properties of the disks were verified and analyzed at various disk locations.The results show that the grain sizes of the full-size dual-microstructure disk match the predictions;by adjusting the thermal insulation size and holding time during heat treatment,the temperature gradient can be modified.The grain size transition zone exhibits a smooth change;fine-grained structures are in favor of low-temperature strength,while coarse-grained structures provide better resistance to high-temperature creep.
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